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1. Oxford American Dictionary

   counterbore

   • IPA[ˈkoun(t)ərˌbôr]

   美式

   • n.
     a drilled hole that has a flat-bottomed enlargement at its mouth.；a drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores in one operation.
   • v.
     drill a counterbore in (an object)

   • verb: counterbore, 3rd person present: counterbores, gerund or present participle: counterboring, past tense: counterbored, past participle: counterbored

   • noun: counterbore, plural noun: counterbores

2. • 釋義

   n.

   名詞

   • 1. a drilled hole that has a flat-bottomed enlargement at its mouth.
   • ▪ a drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores in one operation.

   v.

   動詞

   • 1. drill a counterbore in (an object) dies are counterbored to prevent material build-up
3. • 更多解釋

   counterbore

   • IPA[ˈkaʊntəbɔː]

   英式

   • n.
     a drilled hole that has a wider section at the top.
   • v.
     drill a counterbore in (an object): dies are counterbored to prevent material build-up

   Oxford Dictionary